Refactor nextTick to use a direct import from a Vue package (8/9)

Stanislav Lashmanovrequested to merge
slashmanov/refactor-next-tick-8 into master

What does this MR do and why?

This MR refactors nextTick usage to only use a direct import from the Vue package, instead of multiple options like wrapper.vm.$nextTick or Vue.nextTick. It also aims to use async\await with nextTick wherever possible.

RFC on the nextTick change: gitlab-org/frontend/rfcs#47 (closed)

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